CN101387616A - Measurement method and apparatus for humidity in discharged flue gas - Google Patents
Measurement method and apparatus for humidity in discharged flue gas Download PDFInfo
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- CN101387616A CN101387616A CNA2008101215058A CN200810121505A CN101387616A CN 101387616 A CN101387616 A CN 101387616A CN A2008101215058 A CNA2008101215058 A CN A2008101215058A CN 200810121505 A CN200810121505 A CN 200810121505A CN 101387616 A CN101387616 A CN 101387616A
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Abstract
The invention discloses a humidity measurement method of discharged smoke, comprising the steps of: a, getting object smoke from a flue; b, filtering and thermally insulating the object smoke to obtain an object sample gas; c, the measurement step: feeding the object sample gas into the detection chamber, feeding the measured signals to an analysis module via a humidity sensor in the detection chamber, processing and obtaining the humidity of the smoke in the flue, wherein the aforementioned steps hold the temperature of the object smoke and the object sample gas higher than the dew point of water. The invention further discloses a measurer for realizing the method. The invention has the advantages of prolonged service life of humidity sensors, wide application, simple installment and simple maintenance.
Description
Technical field
The present invention relates to gas-monitoring, particularly a kind of humidity measurement method of discharged smoke and device.
Background technology
In order to monitor the pollutant emission situation of pollution source effectively, many at present employing flue gas discharge continuous monitoring systems go to measure the concentration of harmful gas in the flue, the flow velocity of flue gas, the parameters such as humidity of flue gas, and the described parameter that records delivered to monitoring of environment department, so that take Corresponding Countermeasures according to recording parameter.
In the existing flue gas discharge continuous monitoring system, adopt method on the throne to detect the humidity of flue gas in the flue: humidity sensor is inserted in the tested flue, directly records smoke moisture.Mainly there is following deficiency in this detection method:
1, humidity sensor is fragile, serviceable life is short, cost is high
Environment is abominable in the flue, high dust, severe corrosive, and humidity sensor is fragile;
Be prone to aqueous water in the flue and measure impurity,, when boiler blow-on or blowing out, cause the damage of humidity sensor this moment especially easily as in cogeneration plant;
In order to improve sensor life-time, need to increase the complicacy of probe designs, significantly increased the cost of probe.
2, be of limited application
When dewfall appearred in flue gas in the flue, moisture measurement distortion and humidity sensor were fragile, and therefore the point of application after wet desulphurization or water curtain dedusting can not use;
Be higher than under the situation that the environment for use of humidity sensor requires and use in flue-gas temperature.
3, installation, difficult in maintenance
Need on tested flue, increase thief hole and mounting flange separately, increase the workload of client's input cost and enforcement;
The sampling spot of flue gas discharge continuous monitoring system is usually at the middle part of tested flue such as chimney or higher, and as 40m, the position is higher to patrol and examine and the fault handling difficulty that becomes the daily servicing of humidity sensor.
Summary of the invention
In order to overcome deficiency of the prior art, the invention provides a kind ofly can effectively prolong humidity sensor serviceable life, the humidity measurement method of discharged smoke of applied range, and a kind ofly can effectively prolong humidity sensor serviceable life, measurement mechanism that applied range, installation and maintenance are easy to humidity in the discharging flue gas.
For achieving the above object, the present invention is by the following technical solutions:
A kind of discharging continuous flue gas monitoring method may further comprise the steps:
A, sampling procedure
In flue, take out flue gas to be measured;
B, pre-treatment step
The described test sample gas for the treatment of is filtered, is incubated processing, obtain treating test sample gas;
C, measuring process
The described test sample gas for the treatment of is passed in the test chamber, and the capacitance type humidity sensor in the test chamber will record signal and send analysis module, obtains the humidity of flue gas in the flue after treatment;
In above steps, keep flue gas to be measured, treat that the temperature of test sample gas is higher than the dew point of moisture.
As preferably, in described step c, record the pressure for the treatment of test sample gas, and will record signal and send analysis module.
As preferably, the described test sample gas for the treatment of is passed in the gas compartment, and the measuring light that light source sends is passed and treated test sample gas in the gas compartment, is received after absorbing; Received signal obtains treating the parameter of gas componant in the test sample gas after treatment, treats that the temperature of test sample gas is higher than the dew point of moisture.
In order to implement said method, the invention allows for a kind of like this measurement mechanism that discharges humidity in the flue gas, comprise sampler, pretreatment unit, heating arrangement and be arranged on pretreatment unit humidity measuring instrument afterwards, described humidity measuring instrument comprises test chamber, analysis module, pressure transducer, is arranged on the capacitance type humidity sensor in the test chamber, and the output terminal of described capacitance type humidity sensor, pressure transducer connects analysis module; Described heating arrangement cooperates with described test chamber, is used to heat the gas in the test chamber, thereby makes the temperature of described gas be higher than the dew point of moisture.
As preferably, described measurement mechanism also comprises pressure transducer, and the output terminal of pressure transducer connects described analysis module.
As preferably, also comprise gas compartment and gas measurement device, gas compartment is arranged on after the pretreatment unit, and gas measurement device comprises light source, detector and analytical equipment.
As preferably, described humidity sensor is the macromolecule membrane condenser type.
Compared with prior art, the present invention has following beneficial effect:
1, humidity sensor long service life
Take sampling method: the flue gas of high dust, deep-etching in the sampling flue, to measure through filtering, be incubated the back, the flue gas measurement environment after the processing is good, has prolonged the serviceable life of humidity sensor;
Owing to be the described flue gas of insulation in whole humidity measuring instrument, make the temperature of flue gas be higher than the dew point of water all the time, therefore, there is not aqueous water in the flue gas to be measured, prolonged the serviceable life of humidity sensor.
2, applied range
All the time be higher than the dew point of water owing to guarantee the temperature of flue gas in whole measuring process, so flue gas dewfall can not occur, moisture measurement is accurate, is applicable to various complexity, bad working environments.
3, install, safeguard easily
Need not increases thief hole and mounting flange separately on tested flue, only need to improve on existing flue gas discharge continuous monitoring system to get final product;
Humidity measuring instrument can be arranged on ground, installation, easy to maintenance.
Description of drawings
Fig. 1 is the structural representation that discharges the measurement mechanism of humidity in the flue gas among the embodiment 1;
Fig. 2 is the structural representation that discharges the measurement mechanism of humidity in the flue gas among the embodiment 2.
Embodiment
Following examples have been done further instruction to situations such as structure of the present invention, function and applications, are several reasonable application forms of the present invention, but scope of the present invention is not confined to following embodiment.Embodiment 1:
As shown in Figure 1, a kind of measurement mechanism that discharges humidity in the flue gas, be applied in the flue gas discharge continuous monitoring system of cogeneration plant, be installed on the chimney 1 of cogeneration plant, comprise sampler, pretreatment unit, humidity measuring instrument, heating arrangement, gas compartment 61 and gas measurement device 62.
Sampler comprises sampling probe 2, ejector 8, and described sampling probe 2 is installed on the chimney 1.
Pretreatment unit comprises one-level pretreatment unit 31 and secondary pretreatment unit 32, is used to filter out materials such as dust in flue gas, tar, makes the flue gas cleaning that becomes, and satisfies the needs of measuring.Connect by heat tracing pipe 4 between one-level pretreatment unit 31 and the secondary pretreatment unit 32.
Described humidity measuring instrument comprises test chamber 71, analysis module 73, is arranged on the macromolecule membrane capacitance type humidity sensor 72 in the test chamber, described test chamber is installed in the endpiece of gas compartment 61, and the output terminal of described humidity sensor 72 connects described analysis module 73.
Described ejector 8 is installed in the endpiece of test chamber 71, is used for cooperating the flue gas that takes out in the chimney 1 with described sampling probe 2.
Described heating arrangement is divided into two parts, wherein a part of 5-1 is used to heat described sampling probe 2 and one-level pretreatment unit 31, another part 5-2 is used to heat secondary pretreatment unit 32, gas compartment 61 and test chamber 71, makes the temperature of flue gas and sample gas be higher than the dew point of water all the time.
The present invention has also disclosed a kind of humidity measurement method of discharged smoke, may further comprise the steps:
A, sampling procedure
B, pre-treatment step
The sampling flue gas through one-level pretreatment unit 31 after, be transported to secondary pretreatment unit 32 by heat tracing pipe 4, heat tracing pipe 3 adopts type of heating to make and inner treats that test sample temperature degree is 140 ℃, is higher than the dew point of water;
Pretreatment unit filters out particles such as dust in flue gas, tar, thereby obtains treating test sample gas; Simultaneously, heating arrangement 5-2 heats described secondary pretreatment unit 32, and making the flue-gas temperature in this device 32 is 180 ℃, is higher than the dew point of water;
C, flue gas to be measured lead in the gas compartment 61
The light that light source sends passes the sample gas in the gas compartment 61, after be detected device and receive, install the parameter that obtains each composition gas in the sample gas after the analysis of 62 inner analysis unit by analysis, as the concentration of oxides of nitrogen, sulphuric dioxide;
The sample gas that flows out from described gas compartment 61 is led in the test chamber 71, and described humidity sensor 72 will record signal and send described analysis module 73, obtains the relative humidity that sample gas is flue gas in the chimney 1 after by analysis;
Described heating arrangement 5-2 heats described gas compartment 61 and test chamber 71, and what make inside treats that test sample temperature degree is 145 ℃, is higher than the dew point of water.
Embodiment 2:
As shown in Figure 2, a kind of measurement mechanism that discharges humidity in the flue gas, as different from Example 1:
1, removes the secondary pretreatment unit.
2, described test chamber 71 is arranged between one-level pretreatment unit 31 and the gas compartment 61, and entrance point is connected with one-level pretreatment unit 31.
3, heat tracing pipe no longer is set, but sampling probe 2, one-level pretreatment unit 31, gas compartment 61, test chamber 71 are arranged in the heating arrangement 5.
4, analysis module 73 is set no longer separately, but with humidity sensor 72 record supply gas analytic unit in the fluid measurement device 62 of signal, and obtain the humidity of flue gas after handling by this analytic unit.
5, pressure transducer 74 is arranged on the gas piping between test chamber 71 and the gas compartment 61.
Present embodiment has also disclosed a kind of humidity measurement method of discharged smoke, as different from Example 1:
1, the flue gas in the sampling probe 2 sampling chimneys 1 is transported in the one-level pretreatment unit 31 afterwards.
2, humidity sensor 72, pressure transducer 74 will record supply gas analytic unit in the fluid measurement device 62 of signal, obtain the absolute humidity of flue gas after this analytic unit analysis.
Above-mentioned embodiment should not be construed as limiting the scope of the invention.Under the situation that does not break away from spirit of the present invention, any type of change that the present invention is made all should fall within protection scope of the present invention.
Claims (7)
1, a kind of humidity measurement method of discharged smoke may further comprise the steps:
A, sampling procedure
In flue, take out flue gas to be measured;
B, pre-treatment step
Described flue gas to be measured is filtered, is incubated processing, obtain treating test sample gas;
C, measuring process
The described test sample gas for the treatment of is passed in the test chamber, and the humidity sensor in the test chamber will record signal and send analysis module, obtains the humidity of flue gas in the flue after treatment;
In above steps, keep flue gas to be measured, treat that the temperature of test sample gas is higher than the dew point of moisture.
2, measuring method according to claim 1 is characterized in that: in described step c, record the pressure for the treatment of test sample gas, and will record signal and send analysis module.
3, measuring method according to claim 1 and 2 is characterized in that: the described test sample gas for the treatment of is passed in the gas compartment, and the measuring light that light source sends is passed and treated test sample gas in the gas compartment, is received after absorbing; Received signal obtains treating the parameter of gas componant in the test sample gas after treatment, treats that the temperature of test sample gas is higher than the dew point of moisture.
4, a kind of measurement mechanism that discharges humidity in the flue gas, comprise sampler, pretreatment unit, heating arrangement and be arranged on pretreatment unit humidity measuring instrument afterwards, described humidity measuring instrument comprises test chamber, analysis module, is arranged on the humidity sensor in the test chamber, and the output terminal of described humidity sensor connects analysis module; Described heating arrangement cooperates with described test chamber.
5, measurement mechanism according to claim 4 is characterized in that: described measurement mechanism also comprises pressure transducer, and the output terminal of pressure transducer connects described analysis module.
6, according to claim 4 or 5 described measurement mechanisms, it is characterized in that: comprise that also by gas compartment and gas measurement device, gas compartment is arranged on after the pretreatment unit, gas measurement device comprises light source, detector and analytical equipment.
7, according to claim 4 or 5 described measurement mechanisms, it is characterized in that: described humidity sensor is the macromolecule membrane condenser type.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101215058A CN101387616A (en) | 2008-10-09 | 2008-10-09 | Measurement method and apparatus for humidity in discharged flue gas |
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| CNA2008101215058A CN101387616A (en) | 2008-10-09 | 2008-10-09 | Measurement method and apparatus for humidity in discharged flue gas |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986127A (en) * | 2010-09-16 | 2011-03-16 | 项义考 | Pretreatment method for dehydrating, dedusting and retaining components to be detected in boiler smoke detection |
| CN102644912A (en) * | 2011-12-13 | 2012-08-22 | 上海发电设备成套设计研究院 | Online monitoring and controlling device and method for safety risk of heat exchange tube of power station boiler |
| CN102778445A (en) * | 2012-08-21 | 2012-11-14 | 南京埃森环境技术有限公司 | Intelligent analyzer and detection method for standard state dry basis |
| CN101561426B (en) * | 2009-05-22 | 2013-01-09 | 大唐南京自动化有限公司 | Humidity measuring method and measuring device used for CEMS system |
| CN102937618A (en) * | 2012-10-26 | 2013-02-20 | 河北省电力公司电力科学研究院 | Post-desulphurization flue gas moisture content determination method and apparatus |
| CN104049074A (en) * | 2014-07-02 | 2014-09-17 | 江苏大学 | Method and device for estimating sludge moisture content in sludge drying process |
| CN104968438A (en) * | 2012-09-14 | 2015-10-07 | 普莱梅克斯处理专家股份有限公司 | Humidity sensing system |
| CN105203471A (en) * | 2014-06-21 | 2015-12-30 | 青岛理工大学 | Novel flue gas tester |
| CN105548503A (en) * | 2016-01-29 | 2016-05-04 | 中绿环保科技股份有限公司 | Integral smoke gas sampling and humidity measuring device |
| CN105866180A (en) * | 2016-05-31 | 2016-08-17 | 福建龙净环保股份有限公司 | Monitoring device for liquid water in flue |
| CN106645598A (en) * | 2017-03-08 | 2017-05-10 | 上海灵湃测控技术有限公司 | Flue gas hygrometer |
| CN112964837A (en) * | 2021-03-23 | 2021-06-15 | 浙江大学 | Device and method for measuring absolute humidity of high-humidity flue gas |
-
2008
- 2008-10-09 CN CNA2008101215058A patent/CN101387616A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101561426B (en) * | 2009-05-22 | 2013-01-09 | 大唐南京自动化有限公司 | Humidity measuring method and measuring device used for CEMS system |
| CN101986127A (en) * | 2010-09-16 | 2011-03-16 | 项义考 | Pretreatment method for dehydrating, dedusting and retaining components to be detected in boiler smoke detection |
| CN102644912A (en) * | 2011-12-13 | 2012-08-22 | 上海发电设备成套设计研究院 | Online monitoring and controlling device and method for safety risk of heat exchange tube of power station boiler |
| CN102644912B (en) * | 2011-12-13 | 2014-02-19 | 上海发电设备成套设计研究院 | Online monitoring and controlling device and method for safety risk of heat exchange tube of power station boiler |
| CN102778445B (en) * | 2012-08-21 | 2015-07-15 | 南京埃森环境技术有限公司 | Intelligent analyzer and detection method for standard state dry basis |
| CN102778445A (en) * | 2012-08-21 | 2012-11-14 | 南京埃森环境技术有限公司 | Intelligent analyzer and detection method for standard state dry basis |
| CN104968438A (en) * | 2012-09-14 | 2015-10-07 | 普莱梅克斯处理专家股份有限公司 | Humidity sensing system |
| CN102937618A (en) * | 2012-10-26 | 2013-02-20 | 河北省电力公司电力科学研究院 | Post-desulphurization flue gas moisture content determination method and apparatus |
| CN102937618B (en) * | 2012-10-26 | 2016-02-03 | 河北省电力公司电力科学研究院 | A kind of flue gas after desulfurization water capacity assay method and device |
| CN105203471A (en) * | 2014-06-21 | 2015-12-30 | 青岛理工大学 | Novel flue gas tester |
| CN104049074A (en) * | 2014-07-02 | 2014-09-17 | 江苏大学 | Method and device for estimating sludge moisture content in sludge drying process |
| CN104049074B (en) * | 2014-07-02 | 2016-01-20 | 江苏大学 | The evaluation method of sludge moisture content and device in a kind of mud drying process |
| CN105548503A (en) * | 2016-01-29 | 2016-05-04 | 中绿环保科技股份有限公司 | Integral smoke gas sampling and humidity measuring device |
| CN105548503B (en) * | 2016-01-29 | 2018-05-11 | 中绿环保科技股份有限公司 | Integrated fume samples and humidity measuring instrument |
| CN105866180A (en) * | 2016-05-31 | 2016-08-17 | 福建龙净环保股份有限公司 | Monitoring device for liquid water in flue |
| CN105866180B (en) * | 2016-05-31 | 2018-12-14 | 福建龙净环保股份有限公司 | The monitoring device of liquid water in a kind of flue |
| CN106645598A (en) * | 2017-03-08 | 2017-05-10 | 上海灵湃测控技术有限公司 | Flue gas hygrometer |
| CN112964837A (en) * | 2021-03-23 | 2021-06-15 | 浙江大学 | Device and method for measuring absolute humidity of high-humidity flue gas |
| CN112964837B (en) * | 2021-03-23 | 2022-02-11 | 浙江大学 | Device and method for measuring absolute humidity of high-humidity flue gas |
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Open date: 20090318 |